When creating a extension using Slicer5.9, I've found that the only available type options are "default" and "superbuild".

Development
1

I have successfully built Slicer using the 5.9 source code. However, when I use the generated Slicer application and try to create an extension, in the Extension Wizard interface, I only see two options for “Type” when creating a new extension, as shown in the image below. Could you please help me understand what’s happening and how to resolve this? env is:window11

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If you are not sure about then choose default. The other option is for advanced use, when you build an extension that fetches and builds C++ libraries from external repositories.